JSFiddle - React, Tailwind, and code Playground

JavaScript

var tmp = new Array();
var v = new Array();
for (i = 0; i < 2; i++) {
    var j = 0;
    tmp[i] = setInterval(function () {
        if (j < 10 + (i * 5)) {
            alert(i + ' ' + j);
            j++;
        } else {
            clearInterval(tmp[i])
        }
    }, 1000);
}

console.log(tmp);